Electric Vehicles(EV) and High Performance Papers as Advanced Separators:Recent Development and Problems of EV Batteries

概要

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Since 1994, small-sized lithium-ion batteries have been used in our daily life, such as cellular phone, digital camera, digital audio, note-book computer, power-assisted bicycle and various power tools. In 2009, electric vehicles (EV) using large-sized lithium-ion batteries (10-25 kWh) have been commercialized and now the production numbers are rapidly increasing as the most promising device under the collaboration of automobile companies and battery makers. During last decay, the battery performances such as energy density, power density, and service life have been improved significantly. Also, much efforts for solving safety problem have been put into the development of battery materials such as positive electrodes, negative ones, separators and electrolytes. However, the performances and safety level of the large-sized batteries are not enough for use in the practical EVs. Further improvement has been required for high-speed charging-discharging performances even at a low temperature. The development of advanced separators using high performance papers would be one of the most important task for satisfying both high performances and safety for the large-sized lithium-ion batteries.
High Performance Paper Society, Japanの論文